http://dynacotubeaudio.forumotion.com/feed/? Latest topics Tue, 24 Nov 2009 01:00:50 GMT 10 http://illiweb.com/fa/empty.gif http://dynacotubeaudio.forumotion.com/feed/? http://dynacotubeaudio.forumotion.com/basket-f2/kit-delivery-time-on-bottlehead-amp-kits-4-to-6-weeks-t76.htm RockyAM I am considering one of Bob's Dynaco ST-70 kits OR one of the Bottlehead kits. The thing that gets me though is that on the Bottlehead web site they mention a 4 to 6 week wait before you get your kit. Bottlehead charges your credit card the DAY of your order and put you on a list! They claim that they can provide you with a "lower price" this way. Personally I have never heard of any company doing business this way and feel if they charge your card they should ship the item. They have ... Basket Tue, 24 Feb 2009 00:25:07 GMT http://dynacotubeaudio.forumotion.com/basket-f2/kit-delivery-time-on-bottlehead-amp-kits-4-to-6-weeks-t76.htm#234 http://dynacotubeaudio.forumotion.com/basket-f2/kit-delivery-time-on-bottlehead-amp-kits-4-to-6-weeks-t76.htm http://dynacotubeaudio.forumotion.com/basket-f2/12at7-tube-testing-importance-t117.htm Reid
Your thoughts please.]]> Basket Sat, 02 May 2009 00:00:39 GMT http://dynacotubeaudio.forumotion.com/basket-f2/12at7-tube-testing-importance-t117.htm#457 http://dynacotubeaudio.forumotion.com/basket-f2/12at7-tube-testing-importance-t117.htm http://dynacotubeaudio.forumotion.com/basket-f2/source-for-pc-5-and-pc-6-borads-looking-for-t204.htm atwageman
Oh and in case I forget, Happy Thanksgiving everybody.]]> Basket Tue, 24 Nov 2009 00:56:34 GMT http://dynacotubeaudio.forumotion.com/basket-f2/source-for-pc-5-and-pc-6-borads-looking-for-t204.htm#1009 http://dynacotubeaudio.forumotion.com/basket-f2/source-for-pc-5-and-pc-6-borads-looking-for-t204.htm http://dynacotubeaudio.forumotion.com/basket-f2/80403020525v-cap-where-can-i-get-one-t205.htm Tanner Everybody is out of stock on these, where can I get one ASAP??? Basket Tue, 24 Nov 2009 01:00:50 GMT http://dynacotubeaudio.forumotion.com/basket-f2/80403020525v-cap-where-can-i-get-one-t205.htm#1010 http://dynacotubeaudio.forumotion.com/basket-f2/80403020525v-cap-where-can-i-get-one-t205.htm http://dynacotubeaudio.forumotion.com/basket-f2/new-to-the-forum-t197.htm kevinmi Hi my name is Kevin, and I'm a newtubeaholic. I just built a ST120 amp from Bob Latino, and I'm enjoying it immensely, when I'm not breaking it. So far I had one of the KT88's that wouldn't bias (Bob replaced it), I broke a 12AT7, and I think I blew out the tube rectifier also. Luckily I bought a SS rectifier from Bob also, so I'm playing the tunes. I can't figure out how to post pics on this forum. Can someone help me out? I am pretty active on the Klipsch Community forum, and I posted ... Basket Tue, 17 Nov 2009 22:34:36 GMT http://dynacotubeaudio.forumotion.com/basket-f2/new-to-the-forum-t197.htm#957 http://dynacotubeaudio.forumotion.com/basket-f2/new-to-the-forum-t197.htm http://dynacotubeaudio.forumotion.com/basket-f2/how-to-wire-the-mkiii-in-cathode-bias-t203.htm Wieslaw Lipowski I would like to get rid of the fixed bias setup in my old MkIII's and wire them in the cathode bias instead. I hope in this way I won't have problems with setting and readjusting the bias anymore. I am thinking of using 1K/5W resistors and 220uF/160V (orange Rubicon HSF) electrolytics at the cathodes, and 470K grid-leak resistors. The B+ is stock 480V. What do you think? Is this worth doing sound and safety wise? Thanks in advance Wieslaw Basket Sat, 21 Nov 2009 22:20:19 GMT http://dynacotubeaudio.forumotion.com/basket-f2/how-to-wire-the-mkiii-in-cathode-bias-t203.htm#1003 http://dynacotubeaudio.forumotion.com/basket-f2/how-to-wire-the-mkiii-in-cathode-bias-t203.htm http://dynacotubeaudio.forumotion.com/basket-f2/pros-and-cons-of-using-solid-state-rectifiers-in-dynaco-amps-t34.htm Anonymous All the Dynaco amps I have seen use tube rectifiers. Can you modify a Dynaco amp to use a solid state rectifier in place of the tube rectifier? Any pros and cons of doing this ? Dynaluva Basket Mon, 29 Dec 2008 13:29:30 GMT http://dynacotubeaudio.forumotion.com/basket-f2/pros-and-cons-of-using-solid-state-rectifiers-in-dynaco-amps-t34.htm#70 http://dynacotubeaudio.forumotion.com/basket-f2/pros-and-cons-of-using-solid-state-rectifiers-in-dynaco-amps-t34.htm http://dynacotubeaudio.forumotion.com/basket-f2/gsi-board-i-need-a-parts-list-and-any-diagram-s-t196.htm Tanner ]]> Basket Sun, 15 Nov 2009 12:38:23 GMT http://dynacotubeaudio.forumotion.com/basket-f2/gsi-board-i-need-a-parts-list-and-any-diagram-s-t196.htm#940 http://dynacotubeaudio.forumotion.com/basket-f2/gsi-board-i-need-a-parts-list-and-any-diagram-s-t196.htm http://dynacotubeaudio.forumotion.com/basket-f2/what-are-your-favorite-test-cd-s-or-lp-s-t201.htm Bob Latino So what are your favorite CD's or LP's that you usually test out a new piece of gear in your system ? You know the drill > you have a new preamp, amp, CD player etc. and you bring out a piece of music that you are familiar with and want to know how "different" (good or bad) it sounds with the new piece of gear. Below are a few of mine which tend more towards vocals, acoustic jazz and some classic rock ... 1. Karrin Allyson "In Blue" (Concord CD) - A great album, well ... Basket Fri, 20 Nov 2009 00:10:39 GMT http://dynacotubeaudio.forumotion.com/basket-f2/what-are-your-favorite-test-cd-s-or-lp-s-t201.htm#988 http://dynacotubeaudio.forumotion.com/basket-f2/what-are-your-favorite-test-cd-s-or-lp-s-t201.htm http://dynacotubeaudio.forumotion.com/basket-f2/vta-resistors-t199.htm kost
I am thinking to lower the VTA output and this is a good chance to replace the resistors with better quality ones.
Any suggestions? Riken, kiwame or...?

cheers

kost]]> Basket Wed, 18 Nov 2009 12:03:06 GMT http://dynacotubeaudio.forumotion.com/basket-f2/vta-resistors-t199.htm#964 http://dynacotubeaudio.forumotion.com/basket-f2/vta-resistors-t199.htm http://dynacotubeaudio.forumotion.com/basket-f2/st-70-quad-cap-long-post-t171.htm Bugs I have two ST 70s that I have built to be indentical using VTA boards and upgraded quad caps. The only difference is that I have fitted one of Bob's triode/pentode switches to one and haven't got around to doing that in the other. The amp with the triode/pentode switch developed a progressively louder hum over the course of a couple of weeks and along with degraded sound quality from the speakers. I suspected the input transformer and ordered a replacement. While I was putting in the ... Basket Tue, 22 Sep 2009 19:21:36 GMT http://dynacotubeaudio.forumotion.com/basket-f2/st-70-quad-cap-long-post-t171.htm#802 http://dynacotubeaudio.forumotion.com/basket-f2/st-70-quad-cap-long-post-t171.htm http://dynacotubeaudio.forumotion.com/basket-f2/another-stereo-70-resto-mod-completed-t190.htm tomlang Here is my ST70 I just completed. Many probably would not choose solid state rectification (there is 600 uF on-board and NO hum) but most will probably agree the amphenol jacks in the front do a good job of providing modern physical separation of the input jacks while covering up (just barely) the old holes for the original jacks and especially the unnecessary stereo-mono switch hole. I did provide a thermister to limit turn-on in-rush and I am absolutely NOT convinced that "cathode ... Basket Wed, 04 Nov 2009 01:24:03 GMT http://dynacotubeaudio.forumotion.com/basket-f2/another-stereo-70-resto-mod-completed-t190.htm#901 http://dynacotubeaudio.forumotion.com/basket-f2/another-stereo-70-resto-mod-completed-t190.htm http://dynacotubeaudio.forumotion.com/basket-f2/choices-in-rectifier-tubes-for-vta-t200.htm LEVLHED I've been throughly enjoying my VTA ST-70, recently picked up a Dared SL-2000A preamp and it seems like the perfect match. Now I'm looking into trying some different tubes. Since I've already got some Mullard input tubes order and I've got driver tubes on a few Christmas lists () I was wondering what peoples experiences are with different rectifier tubes for this unit. Mine currently has a Sylvania. I have no idea how it compares to the myriad of other choices out there. Basket Wed, 18 Nov 2009 14:31:22 GMT http://dynacotubeaudio.forumotion.com/basket-f2/choices-in-rectifier-tubes-for-vta-t200.htm#968 http://dynacotubeaudio.forumotion.com/basket-f2/choices-in-rectifier-tubes-for-vta-t200.htm http://dynacotubeaudio.forumotion.com/your-dynaco-sytem-f1/new-build-st120-t198.htm kevinmi New member here with some pics of my new ST120 Your Dynaco sytem Tue, 17 Nov 2009 23:57:45 GMT http://dynacotubeaudio.forumotion.com/your-dynaco-sytem-f1/new-build-st120-t198.htm#959 http://dynacotubeaudio.forumotion.com/your-dynaco-sytem-f1/new-build-st120-t198.htm http://dynacotubeaudio.forumotion.com/basket-f2/volume-tone-controls-and-input-switching-t154.htm tomlang
I suppose if I routed all my audio media through my laptop I could use it but that will not normally be the case.]]> Basket Thu, 13 Aug 2009 03:52:39 GMT http://dynacotubeaudio.forumotion.com/basket-f2/volume-tone-controls-and-input-switching-t154.htm#708 http://dynacotubeaudio.forumotion.com/basket-f2/volume-tone-controls-and-input-switching-t154.htm http://dynacotubeaudio.forumotion.com/basket-f2/star-grounding-scheme-observations-and-questions-t187.htm tomlang I am presently restoring a ST70 and while at it, installing a VTA driver board. In so doing, I have some observations about how the board itself is grounded. First off, the board does have a dedicated single wire leading to the chassis star ground. However, the board itself is held to the chassis with metal screws that contact the printed circuit board ground bus that goes around the perimeter of the board itself. Doesn't this negate the star-ground effect? Shouldn't the board be insulated ... Basket Thu, 29 Oct 2009 16:05:31 GMT http://dynacotubeaudio.forumotion.com/basket-f2/star-grounding-scheme-observations-and-questions-t187.htm#887 http://dynacotubeaudio.forumotion.com/basket-f2/star-grounding-scheme-observations-and-questions-t187.htm http://dynacotubeaudio.forumotion.com/basket-f2/the-height-of-audio-voodoo-400-ultra-tweeters-and-a-485-wooden-knob-for-your-volume-control-t172.htm Bob Latino There are many "audio voodoo" products out there. It is hard for me to believe that anyone would even have the "balls" to offer such a product and even harder to believe that anyone would actually BUY such a product. 1. The $400 "ultra tweeters" operate and produce "energy" in the GIGAHERTZ (1,000,000,000 Hz) range to enhance your audio listening experience. Read about it at the link below ... Ultra Tweeters 2. How about $485 for ... Basket Sun, 27 Sep 2009 15:28:47 GMT http://dynacotubeaudio.forumotion.com/basket-f2/the-height-of-audio-voodoo-400-ultra-tweeters-and-a-485-wooden-knob-for-your-volume-control-t172.htm#814 http://dynacotubeaudio.forumotion.com/basket-f2/the-height-of-audio-voodoo-400-ultra-tweeters-and-a-485-wooden-knob-for-your-volume-control-t172.htm http://dynacotubeaudio.forumotion.com/basket-f2/vta-parts-upgrade-t194.htm kost Hi I have three questions about the vta mod that i have and enjoy for two years. I am thinking to lower the VTA output and this is a good chance to replace with better quality resistors.Any suggestions?Riken, kiwame or what? My vta version has the o.33 mf auricaps. As far as i see the vta uses 0.22mf. What is the best capacitance? I want to replace the 0.022mf 150v ceramic disc of the power transformer,can you please suggest? cheers kost Basket Wed, 11 Nov 2009 10:00:21 GMT http://dynacotubeaudio.forumotion.com/basket-f2/vta-parts-upgrade-t194.htm#923 http://dynacotubeaudio.forumotion.com/basket-f2/vta-parts-upgrade-t194.htm http://dynacotubeaudio.forumotion.com/basket-f2/my-st-35-build-t193.htm atwageman I've got some PC-13 boards and parts laying around and thinking of building one from the ground up using my own chassis (hammond). I got to thinking as I was reviewing the schematic, why not run dc out to the heaters. But then again maybe I should just go with how Dynaco intended it to be. Anyways I'm reaching out to the group here to see if anyone here is running a ST-35 with DC heat and have they noticed any difference in how the amp sounds. Btw--Im new to the forum, but not ... Basket Mon, 09 Nov 2009 02:18:34 GMT http://dynacotubeaudio.forumotion.com/basket-f2/my-st-35-build-t193.htm#918 http://dynacotubeaudio.forumotion.com/basket-f2/my-st-35-build-t193.htm http://dynacotubeaudio.forumotion.com/basket-f2/nailing-down-bias-t173.htm kevco I have an ST70 using the DIYTube driver board, solid state rectification and a Cyrus Chong cap board. My output tubes are a "matched" quad of Electro Harmonix 6CA7's with approx 150 hours on them. I have been biasing at 400mV per tube. I set my bias with the speakers connected and with the input sockets shorted. I notice that if my tubes are biased at 400mV after a short warm up, their bias will rise to 425 to 435 after a couple hours of play. If the amp is allowed to cool off, ... Basket Mon, 28 Sep 2009 20:51:38 GMT http://dynacotubeaudio.forumotion.com/basket-f2/nailing-down-bias-t173.htm#816 http://dynacotubeaudio.forumotion.com/basket-f2/nailing-down-bias-t173.htm http://dynacotubeaudio.forumotion.com/basket-f2/a-question-about-st-70-can-capacitor-upgrades-t188.htm quadaptor I noticed that one of the current Dynaco kit manufacturers has a new (at least new to me) electrolytic can capictor for ST-70s that has higher ratings. The capacitor is advertised as being for thir MK III amp kit, but will also work with ST-70s. I asked the manufacturer to compare the capacitor with their other can capicitor upgrade for the ST-70 amp and got the following response: The only thing common to these two capacitors is the MFD values and physical dimensions. Our # 284320-2 ... Basket Sun, 01 Nov 2009 16:58:39 GMT http://dynacotubeaudio.forumotion.com/basket-f2/a-question-about-st-70-can-capacitor-upgrades-t188.htm#889 http://dynacotubeaudio.forumotion.com/basket-f2/a-question-about-st-70-can-capacitor-upgrades-t188.htm http://dynacotubeaudio.forumotion.com/basket-f2/assembled-kits-and-4-ohm-speakers-t186.htm LEVLHED Since they appear to only have one set of posts per side I am wondering how that works.
I have a pair of Polk in-wall LCi-RTS105's that are 4 ohm, supplemented by a pair of powered 10" subs.

Thank you,

levlhed]]> Basket Mon, 26 Oct 2009 16:09:31 GMT http://dynacotubeaudio.forumotion.com/basket-f2/assembled-kits-and-4-ohm-speakers-t186.htm#883 http://dynacotubeaudio.forumotion.com/basket-f2/assembled-kits-and-4-ohm-speakers-t186.htm http://dynacotubeaudio.forumotion.com/basket-f2/the-height-of-audio-voodoo-t185.htm 4MarkNY I'm thinking that Busto, in Italy, has most of this stuff, and then some. Those gotta be the biggest, baddest subwoofers I've ever felt..... http://images.google.com/imgres?imgurl=http://www.royaldevice.com/sala%2520audio/td160%2520decoupling.jpg&imgrefurl=http://www.royaldevice.com/custom.htm&usg=__bMRN4T4F2yozpmovGRHVkCeRvlg=&h=600&w=800&sz=101&hl=en&start=7&um=1&tbnid=5_mZWKqglXNAcM:&tbnh=107&tbnw=143&prev=/images%3Fq%3Dthorens%2Btd-160%26hl%3Den%26sa%3DN%26um%3D1 Basket Mon, 26 Oct 2009 00:03:33 GMT http://dynacotubeaudio.forumotion.com/basket-f2/the-height-of-audio-voodoo-t185.htm#882 http://dynacotubeaudio.forumotion.com/basket-f2/the-height-of-audio-voodoo-t185.htm http://dynacotubeaudio.forumotion.com/basket-f2/black-sable-el34-s-for-vta-st-70-t184.htm RockyAM I have one of Bob's ST-70's that I built from a kit about two years ago. I use it a lot and I am thinking about a new set of EL34 output tubes for the amp. I heard about these new Svetlana Black Sable EL34's. I checked online at the Tube Depot and they are pretty expensive. Has anyone used them or know anything about them ? RockyAM Basket Sun, 25 Oct 2009 14:26:52 GMT http://dynacotubeaudio.forumotion.com/basket-f2/black-sable-el34-s-for-vta-st-70-t184.htm#880 http://dynacotubeaudio.forumotion.com/basket-f2/black-sable-el34-s-for-vta-st-70-t184.htm http://dynacotubeaudio.forumotion.com/basket-f2/good-values-in-audio-today-add-yours-t182.htm Bob Latino There is a thread on the forum about "audio voodoo" and the financial rip-offs that some sellers attempt to perpetrate on us audiophiles (or is it "audiophools"- lol). What audio product have you personally used which you feel is a good value in audio today? I'll start it off with 3 companies that I have dealt with and have personally used products from whose products are priced fairly for what you get. 1. Tyler Acoustics - This is a high end speaker company with ... Basket Sun, 18 Oct 2009 17:47:44 GMT http://dynacotubeaudio.forumotion.com/basket-f2/good-values-in-audio-today-add-yours-t182.htm#865 http://dynacotubeaudio.forumotion.com/basket-f2/good-values-in-audio-today-add-yours-t182.htm http://dynacotubeaudio.forumotion.com/basket-f2/tubes4hifi-587uf-power-supply-board-for-pas-t183.htm PeterCapo
Can anyone qualify/quantify the improvement that you might be able to expect from this module?

Any reason why it cannot/should not be paralleled-in with a quad cap for even more energy storage?

Thanks.
Peter]]> Basket Wed, 21 Oct 2009 21:18:12 GMT http://dynacotubeaudio.forumotion.com/basket-f2/tubes4hifi-587uf-power-supply-board-for-pas-t183.htm#871 http://dynacotubeaudio.forumotion.com/basket-f2/tubes4hifi-587uf-power-supply-board-for-pas-t183.htm http://dynacotubeaudio.forumotion.com/basket-f2/new-jj-ecc99-preamp-tube-t181.htm Bugs
Thanks]]> Basket Fri, 16 Oct 2009 23:18:29 GMT http://dynacotubeaudio.forumotion.com/basket-f2/new-jj-ecc99-preamp-tube-t181.htm#861 http://dynacotubeaudio.forumotion.com/basket-f2/new-jj-ecc99-preamp-tube-t181.htm http://dynacotubeaudio.forumotion.com/basket-f2/st-70-sproing-t180.htm Bugs What does it mean when you turn on your amp and you hear the electrical version of 'SPROING' (imagine the sproing sound with a little more 60 cycle hum than a mechanical spring sproing)? The fuse is good and changing the rectifier made no difference. Started doing this yesturday and when I get home tonight a light sproing and then no power, at least the tubes don't light up. I haven't taken a close look at it yet, but thought see if it had any definate meaning to anyone? I am ... Basket Fri, 16 Oct 2009 01:22:47 GMT http://dynacotubeaudio.forumotion.com/basket-f2/st-70-sproing-t180.htm#854 http://dynacotubeaudio.forumotion.com/basket-f2/st-70-sproing-t180.htm http://dynacotubeaudio.forumotion.com/basket-f2/lost-left-channel-on-st-70-t179.htm 4MarkNY I was just a few minutes into a listening session, when the left channel faded out, not to return. I first tried swapping the interconnects, no change, same side. I next swapped the 7199s, noticing that the left front power tube and the 7199 on the left side were only warm, while the other power tubes (including the back left one) where up to temp. The 7199 now came up to bright and temp when moved to the right. The other now, dark and cold.... The power tubes did the same when swapped, ... Basket Wed, 14 Oct 2009 17:43:27 GMT http://dynacotubeaudio.forumotion.com/basket-f2/lost-left-channel-on-st-70-t179.htm#846 http://dynacotubeaudio.forumotion.com/basket-f2/lost-left-channel-on-st-70-t179.htm http://dynacotubeaudio.forumotion.com/basket-f2/dynaco-mark-iii-stock-board-t178.htm sushimaster
- Sushimaster

]]> Basket Tue, 13 Oct 2009 02:01:20 GMT http://dynacotubeaudio.forumotion.com/basket-f2/dynaco-mark-iii-stock-board-t178.htm#841 http://dynacotubeaudio.forumotion.com/basket-f2/dynaco-mark-iii-stock-board-t178.htm http://dynacotubeaudio.forumotion.com/basket-f2/standby-switch-for-st-120-t177.htm THOR-IUM I've seen on different tube amps, along with my guitar amp, a Standby switch. Is there any benefit to installing one on a ST-120? What would it involve to install one? Basket Sun, 11 Oct 2009 02:45:04 GMT http://dynacotubeaudio.forumotion.com/basket-f2/standby-switch-for-st-120-t177.htm#839 http://dynacotubeaudio.forumotion.com/basket-f2/standby-switch-for-st-120-t177.htm http://dynacotubeaudio.forumotion.com/basket-f2/anyone-else-have-a-penchant-lust-for-a-pair-of-mk-iiis-t169.htm JunkyJan Good day Gents! Just wondering: Do anyone else have a pandering / need / "must have" for a pair of Dynaco MK. III monoblocks? For some reason, this is something that has been "growing" like a cancer on me for the past little while. Don't get me wrong, I absolutely LOVE my ST-70 (notwithstanding the criticism being thrown at me continuously regarding my choice of music - according to my teenage kids my Jazz & Classical are so YESTERDAY and my Industrial Rock does ... Basket Sun, 20 Sep 2009 18:52:40 GMT http://dynacotubeaudio.forumotion.com/basket-f2/anyone-else-have-a-penchant-lust-for-a-pair-of-mk-iiis-t169.htm#798 http://dynacotubeaudio.forumotion.com/basket-f2/anyone-else-have-a-penchant-lust-for-a-pair-of-mk-iiis-t169.htm http://dynacotubeaudio.forumotion.com/basket-f2/pas-3-output-impedance-t174.htm myaddiction I have a couple of questions about the high output impedance on the PAS3. I notice on all of the PAS3 that have been modded with the replacement of the selector and only the phono going through the RIAA, that the 510K resistors from the OUTPUT to ground have been removed. Does this raise the output impedance on the PAS? I ran into an issue using the PAS with the Dynaco ST120. Previously I had Advents or Dynaco A50 hooked to the ST120. Well I now have some Klipsch Forte II, and an unusual ... Basket Mon, 05 Oct 2009 22:49:47 GMT http://dynacotubeaudio.forumotion.com/basket-f2/pas-3-output-impedance-t174.htm#829 http://dynacotubeaudio.forumotion.com/basket-f2/pas-3-output-impedance-t174.htm http://dynacotubeaudio.forumotion.com/basket-f2/5ar4-reliability-in-st120-t175.htm Will Power45 I have been using my kit built Stereo 120 for the last month or so. It is a great product. It sounds wonderful in the triode mode with my Reference 3A monitors. I am surprised how quiet it is. However last night the supplied Ruby rectifier tube lit up and blew the fuse. I replaced it with another Chinese tube and all is good. Is there a reliability problem with the Ruby rectifier. Should I bite the bullet and get a fancy NOS tube, go with a solid state plug in module or keep using the Chinese ... Basket Tue, 06 Oct 2009 22:20:46 GMT http://dynacotubeaudio.forumotion.com/basket-f2/5ar4-reliability-in-st120-t175.htm#830 http://dynacotubeaudio.forumotion.com/basket-f2/5ar4-reliability-in-st120-t175.htm http://dynacotubeaudio.forumotion.com/basket-f2/unbiased-opinion-about-kt-66-t165.htm Tube Nube I was undecided whether to send this as a PM, or to post it. Thinking it might be helpful to others, I decided I'd post. Here's the deal. I swapped in some Gold Lion repro. kt 66 tubes into the VTA ST70, as recommended by Bob and Junky Jan. The amps been singing along nicely for months with many hours of play. Probably more than 50 hours already. I pushed the tubes down gently in their sockets (power off), so they all looked... well, straighter. When I turned the amp on, the ... Basket Wed, 02 Sep 2009 22:15:12 GMT http://dynacotubeaudio.forumotion.com/basket-f2/unbiased-opinion-about-kt-66-t165.htm#768 http://dynacotubeaudio.forumotion.com/basket-f2/unbiased-opinion-about-kt-66-t165.htm http://dynacotubeaudio.forumotion.com/basket-f2/review-tubes4hifi-sp-8se-tube-preamp-kit-t170.htm Bob Latino Roy Mottram, the designer of the VTA driver board and the SP-6, SP-8 preamps, was kind enough to ship me one of his wired and tested SP-8SE (Special Edition) "kit" preamps for evaluation. This preamp is 16 inches wide by 4 1/4 inches high and 12 inches deep and weighs in at a healthy 11 1/2 pounds. The preamp has four high level inputs and one phono level input. It has one tape loop and two outputs on the back. The two outputs are handy if you biamp at times as I sometimes do. The front ... Basket Tue, 22 Sep 2009 10:07:15 GMT http://dynacotubeaudio.forumotion.com/basket-f2/review-tubes4hifi-sp-8se-tube-preamp-kit-t170.htm#800 http://dynacotubeaudio.forumotion.com/basket-f2/review-tubes4hifi-sp-8se-tube-preamp-kit-t170.htm http://dynacotubeaudio.forumotion.com/basket-f2/st70-pa60-transformers-t168.htm Bugs
Is there any difference between the various replacement PA60 transformers available from the various internet dealers or are they all coming out of the same factory?

Thanks,
Bugs]]> Basket Fri, 18 Sep 2009 20:10:44 GMT http://dynacotubeaudio.forumotion.com/basket-f2/st70-pa60-transformers-t168.htm#793 http://dynacotubeaudio.forumotion.com/basket-f2/st70-pa60-transformers-t168.htm http://dynacotubeaudio.forumotion.com/basket-f2/rmaf-october-2-4-2009-t167.htm Listens2tubes http://audiofest.net/2009/index.php
Hi,
Just wondering if any of you are going to attend the Rocky Mountain Audio Fest? It is a great experience for anyone who loves this stuff! This is my third year going and it just gets better. As an added bonus for all us headphone nuts Can Jam will be there as well! So who's up for a roadtrip?]]> Basket Sun, 13 Sep 2009 18:29:43 GMT http://dynacotubeaudio.forumotion.com/basket-f2/rmaf-october-2-4-2009-t167.htm#787 http://dynacotubeaudio.forumotion.com/basket-f2/rmaf-october-2-4-2009-t167.htm http://dynacotubeaudio.forumotion.com/basket-f2/a-great-dynaco-day-t155.htm Sal Today was a very good Dynaco day for me. I acquired a mint in the original box PAS-4 tube preamp, 2 SCA-35's and 2 Mark III mono-blocks! Its amazing what people will throw away... only kidding. I did pay for some of the items. My truck tilted on one side with all the weight in the passenger side.. :-) Here is a photo of the PAS-4 preamp as found. Internally it was clean as a whistle. Regards, Sal Basket Thu, 13 Aug 2009 23:32:14 GMT http://dynacotubeaudio.forumotion.com/basket-f2/a-great-dynaco-day-t155.htm#713 http://dynacotubeaudio.forumotion.com/basket-f2/a-great-dynaco-day-t155.htm http://dynacotubeaudio.forumotion.com/basket-f2/stereophile-magazine-s-1992-review-of-the-panor-built-dynaco-st70-ii-t157.htm kevco http://www.stereophile.com/tubepoweramps/992dynaco/
I stumbled across this today, I had no idea they archived such old reviews online at Stereophile...I think the review does a good job of explaining why Panor's management of the Dynaco name was generally not a success!]]> Basket Thu, 20 Aug 2009 12:41:18 GMT http://dynacotubeaudio.forumotion.com/basket-f2/stereophile-magazine-s-1992-review-of-the-panor-built-dynaco-st70-ii-t157.htm#723 http://dynacotubeaudio.forumotion.com/basket-f2/stereophile-magazine-s-1992-review-of-the-panor-built-dynaco-st70-ii-t157.htm http://dynacotubeaudio.forumotion.com/basket-f2/st-70-mono-configuration-and-quadaptors-t159.htm quadaptor Here's a problem that may be academic in nature, but I'd like to know the answer. I‘m currently using a VTA boarded ST-70 amp and PAS-3X preamp. I also have a second ST-70 that is in stock condition. My system is wired into a Dynaco Quadaptor which I use to power a pair of Boston Acoustics A200 speakers in the front and a pair of Boston A150s in the rear. I usually don't go for gimickry, but I bought a used Quadaptor last summer and found out I really liked how it worked when running four ... Basket Sun, 23 Aug 2009 00:25:35 GMT http://dynacotubeaudio.forumotion.com/basket-f2/st-70-mono-configuration-and-quadaptors-t159.htm#737 http://dynacotubeaudio.forumotion.com/basket-f2/st-70-mono-configuration-and-quadaptors-t159.htm http://dynacotubeaudio.forumotion.com/your-dynaco-sytem-f1/up-and-running-t166.htm Normster

]]> Your Dynaco sytem Sat, 05 Sep 2009 22:59:06 GMT http://dynacotubeaudio.forumotion.com/your-dynaco-sytem-f1/up-and-running-t166.htm#782 http://dynacotubeaudio.forumotion.com/your-dynaco-sytem-f1/up-and-running-t166.htm http://dynacotubeaudio.forumotion.com/basket-f2/sca-35-tube-rolling-suggestions-t164.htm myounger1930 Rebuilding a SCA -35 - wanting any tube rolling suggestion? Basket Mon, 31 Aug 2009 20:20:42 GMT http://dynacotubeaudio.forumotion.com/basket-f2/sca-35-tube-rolling-suggestions-t164.htm#764 http://dynacotubeaudio.forumotion.com/basket-f2/sca-35-tube-rolling-suggestions-t164.htm http://dynacotubeaudio.forumotion.com/basket-f2/dynakit-mark-3-cage-and-dynaco-mark-2-chassis-and-bottom-cover-wanted-t161.htm hatrack71 I need a bottom cover and chassis for a Dynakit Mark 2. I am looking for the chassis with the larger board cutout not the one with the same size board as the Mark 3. I am also looking for a Mark 3 cage. These are just a couple of things needed to put some finishing touches on restorations I am presently completing for my collection. I need these to be in excellent condition with little or no rust or pitting. Thanks, Kyle Basket Wed, 26 Aug 2009 03:11:14 GMT http://dynacotubeaudio.forumotion.com/basket-f2/dynakit-mark-3-cage-and-dynaco-mark-2-chassis-and-bottom-cover-wanted-t161.htm#750 http://dynacotubeaudio.forumotion.com/basket-f2/dynakit-mark-3-cage-and-dynaco-mark-2-chassis-and-bottom-cover-wanted-t161.htm http://dynacotubeaudio.forumotion.com/basket-f2/mk-iii-won-t-bias-properly-t163.htm aliveatfive I'm hoping one of you electro-techs can help me figure this one out. The problem: New construction Mk III built from parts-bin stuff and new Triode-El transformers. Amp went together easily. Surprised at the simplicity of this amp. Plugged it in and got a case of run-away bias. Checked polarity of diodes and electrolytics. Measured resistor and cap values. Everything checks out. Rechecked all connections re schematic and everything seems to be correct. When bias was measured, I pulled ... Basket Wed, 26 Aug 2009 18:36:51 GMT http://dynacotubeaudio.forumotion.com/basket-f2/mk-iii-won-t-bias-properly-t163.htm#754 http://dynacotubeaudio.forumotion.com/basket-f2/mk-iii-won-t-bias-properly-t163.htm http://dynacotubeaudio.forumotion.com/basket-f2/2-quick-newbie-questions-t162.htm Normster First, I received my chassis kit and driver board in record time! Thanks Bob and Roy. After looking things over, I have a couple of questions: 1. Is it OK to use a grounded cord or will this cause ground loop problems? 2. The schematic shows 2 cathode bypass caps (47uF) but they were not in my board kit. Have these been eliminated to reduce gain or should I install them? (Don't worry about sending replacement parts. I have them in stock.) Thanks again for the fast shipping! Basket Wed, 26 Aug 2009 15:05:39 GMT http://dynacotubeaudio.forumotion.com/basket-f2/2-quick-newbie-questions-t162.htm#753 http://dynacotubeaudio.forumotion.com/basket-f2/2-quick-newbie-questions-t162.htm http://dynacotubeaudio.forumotion.com/basket-f2/triode-pentode-switching-system-for-the-dynaco-st-70-t160.htm Bob Latino In one of the Sticky's on the first page of the Forum there is a thread about running your Dynaco ST-70, Mark II, Mark III or Mark IV in the triode mode. There is a basic diagram of a switching system that may be used to go back and forth from triode to pentode. The diagram below gives a little more detail. All you really need is a pair of DPDT switches that can handle 400+ VDC for the ST-70 and one DPDT switch for each of the Mark II, III and IV mono amps. You will also need two 100 ohm 1 watt ... Basket Sun, 23 Aug 2009 00:45:31 GMT http://dynacotubeaudio.forumotion.com/basket-f2/triode-pentode-switching-system-for-the-dynaco-st-70-t160.htm#738 http://dynacotubeaudio.forumotion.com/basket-f2/triode-pentode-switching-system-for-the-dynaco-st-70-t160.htm http://dynacotubeaudio.forumotion.com/basket-f2/j-gordon-holt-has-died-t147.htm GP49 J. Gordon Holt, founder of Stereophile magazine and essentially of subjective evaluation of audio equipment, and a fan of Dynaco tube gear in its heyday, died on Monday at his home in Boulder, CO of complications from COPD (chronic obstructive pulmonary disease) and emphysema. Basket Wed, 22 Jul 2009 21:24:02 GMT http://dynacotubeaudio.forumotion.com/basket-f2/j-gordon-holt-has-died-t147.htm#662 http://dynacotubeaudio.forumotion.com/basket-f2/j-gordon-holt-has-died-t147.htm http://dynacotubeaudio.forumotion.com/basket-f2/pas-3-upgrades-t104.htm tubes4hifi I thought this was old old OLD news, but I still get this question almost every week . . . > I have a PAS-3 I'd like to upgrade, boards,switches, volume, jacks, etc. > what are the sonic differences between the original pc-5 & pc-6 > boards as opposed to your sp-6 and sp-8 boards ? > also do you sell the boards already built up for a nominal fee ? > and do any of these board still retain the tone controls ? > OR is it also possible to ship you my pre-amp ... Basket Wed, 08 Apr 2009 21:26:35 GMT http://dynacotubeaudio.forumotion.com/basket-f2/pas-3-upgrades-t104.htm#389 http://dynacotubeaudio.forumotion.com/basket-f2/pas-3-upgrades-t104.htm http://dynacotubeaudio.forumotion.com/basket-f2/new-to-the-forum-t158.htm Normster
I recently received a Hammond AO-58 (looks like a point-to-point ST70) as a gift and now I'm hooked. I ordered the "rebuild" kit and a new power transformer earlier this week so maybe by next weekend I'll know what all the fuss is about. ]]> Basket Sat, 22 Aug 2009 00:43:54 GMT http://dynacotubeaudio.forumotion.com/basket-f2/new-to-the-forum-t158.htm#729 http://dynacotubeaudio.forumotion.com/basket-f2/new-to-the-forum-t158.htm